(3) The products described in this book are intended to be used for standard applications or general electronic equipment (such as office equipment, communications equipment, measuring instruments and household appliances). Consult our sales staff in advance for information on the following applications: C Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the prod- ucts may directly jeopardize life or harm the human body. C Any applications other than the standard applications intended. Nonmultiplexed address bus Processor operates at the clock input frequency On the Am186ES/ESLV microcontroller, 8-bit or 16-bit memory and I/O static bus option n Enhanced integrated peripherals provide increased functionality, while reducing system costA zero crossing output (ZX) produces an output that is synchro- nized to the zero crossing point of the line voltage. This output can be used to extract timing or frequency information from the line. The signal is also used internally to the chip in the calibration mode. This permits faster and more accurate calibration of the real power calculation. This signal is also useful for synchronization of relay switching with a voltage zero crossing, thus improving the relay life by reducing the risk of arcing.